WO2019087894A1 - Method for decreasing content of saturated hydrocarbon, and purified palm-derived oil or fat - Google Patents

Abstract

The problem of the present invention is to provide a method for decreasing the content of a saturated hydrocarbon in an oil or fat. The present invention provides a method for decreasing the content of a saturated hydrocarbon in a purified oil or fat, the method including subjecting a raw material oil or fat to a short path distillation treatment under a temperature condition of 50 to 270°C inclusive. In the short path distillation treatment, the rate of feeding of the raw material oil or fat to a short path distillation device may be 30.0 kg/h·m² or less per unit area of a distillation surface of the short path distillation device. The rate of feeding may be 5.00 to 25.0 kg/h·m² inclusive per unit area of the distillation surface of the short path distillation device.

Description

Method for reducing saturated hydrocarbon content and refined palm oil

The present invention relates to a method for reducing the content of saturated hydrocarbons and a refined palm oil.

Various minor components are present in fats and oils. Examples of such minor components include glycidol, 3-chloropropane-1,2-diol and fatty acid esters thereof. It has been pointed out that there may be nutritional problems with the above trace components, but if it is present in fats and oils such as vegetable oils that have been ingested from the diet for many years, it will immediately affect health Are not considered, and intake criteria etc. have not been established. However, since there is a need for highly safe fats and oils, various methods for reducing the above-mentioned components in fats and oils have been proposed (for example, Patent Document 1 etc.).

In addition, it is known that minor components derived from raw materials are contained in fats and oils, and examples of such components include saturated hydrocarbons. With regard to saturated hydrocarbons, it is not considered to affect health if they are present in fats and oils taken from normal diets and the like.

International Publication 2015/057139 (A1) brochure

Here, since the saturated hydrocarbon is also a component contained in the mineral oil and the like, the food material contaminated with the mineral oil may also contain the saturated hydrocarbon. In such a case, even if mineral oil is not contained in the fat and oil itself to be blended in the food material, it can not be distinguished in analysis whether the saturated hydrocarbon is derived from the fat or food or from the food material. May be determined to be included. Therefore, as a result, there was a situation equivalent to the production of fat and oil containing saturated hydrocarbons. In addition, in the case of food materials containing fats and oils, if they are contaminated with saturated hydrocarbons, the saturated hydrocarbons can not be removed. Therefore, it was difficult to use the food material not only for food but also for uses other than food, and there were cases where it was discarded.

From the above points, there is a need for a method for reducing the content of saturated hydrocarbons in fats and oils regardless of the origin of the saturated hydrocarbons.

This invention is made in view of the said situation, and it aims at providing the method of reducing the content of the saturated hydrocarbon in fats and oils.

The present inventors have found that the above-mentioned problems can be solved by subjecting the raw material fat and oil to short-stroke distillation treatment at a temperature of 50 ° C. or more and 270 ° C. or less, and have completed the present invention. Specifically, the present invention provides the following.

(1) A method for reducing the content of saturated hydrocarbons in a refined fat or oil, which comprises subjecting a raw fat or oil to short-stroke distillation treatment at a temperature of 50 ° C. or more and 270 ° C. or less.

(2) In the short stroke distillation process, the feed rate of the raw material fats and oils to the short stroke distillation apparatus is 30.0 kg / h · m ² or less per unit area of the evaporation surface of the short stroke distillation apparatus (1 The reduction method as described in 2.).

(3) the feed rate, the short path distillation apparatus at the evaporation surface ^{25.0kg / h · m 2 5.00kg /} h · m 2 or more per unit area of the following, reducing method according to (2).

(4) The reduction method according to any one of (1) to (3), wherein the pressure condition in the short stroke distillation treatment is a vacuum degree of 0.1000 Pa or less.

(5) The upper limit value of the temperature condition in the short stroke distillation treatment is 200 ° C. or less, and the feed rate of the raw material fat and oil to the short stroke distillation device is 25 per unit area of the evaporation surface of the short stroke distillation device. The reduction method according to any one of (1) to (4), which is not more than 0 kg / h · m ² .

(6) The upper limit of the temperature condition in the short stroke distillation treatment is 200 ° C. or less, and the pressure condition is a vacuum degree of 0.0001 Pa or more and 0.0200 Pa or less. The reduction method described in.

(7) The reduction method according to any one of (1) to (6), wherein the short stroke distillation treatment is performed twice or more.

(8) The reduction method according to any one of (1) to (7), wherein the raw material fat and oil is a fat and oil which has not been heated at 200 ° C. or higher.

(9) The reduction method according to any one of (1) to (8), wherein the raw material fat and oil is palm-based fat and oil.

(10) The reduction method as described in (9) whose content of the saturated hydrocarbon in the said palm oil fat after the said short stroke distillation process is 15 mg / kg or less.

(11) A refined palm oil having a content of saturated hydrocarbon having 20 to 35 carbon atoms is 15 mg / kg or less.

According to the present invention, there is provided a method of reducing the content of saturated hydrocarbons in fats and oils.

Hereinafter, although the embodiment of the present invention is described, the present invention is not limited to the following embodiment.

The method for reducing the content of saturated hydrocarbons in the refined fats and oils of the present invention (hereinafter, also referred to as "the reducing method of the present invention") short-stroke distillation of raw material fats and oils under temperature conditions of 50 ° C to 270 ° C. Including. Hereinafter, the reduction method of the present invention is described in detail. In the present invention, "raw material fat and oil" means fat and oil to be subjected to short stroke distillation treatment, and "purified fat and oil" means fat and oil subjected to at least short stroke distillation treatment.

[Short-stroke distillation treatment]
Raw material fats and oils in the present invention are subjected to a short stroke distillation process. The short stroke distillation processing means that the raw material oil and fat is made into a thin film and heated under reduced pressure and evaporated under the condition that the agglomerator is disposed about the same distance as the mean free path of the evaporation molecules. By such treatment, it is possible to obtain a residual portion (corresponding to a refined fat) from which a distillate is separated from the raw material fat. The distillate may contain fatty acids, monoglycerides and / or diglycerides and the like. Residues include triglycerides and the like.

As a result of studies by the present inventor, it was found that the content of saturated hydrocarbons in fats and oils can be reduced by adjusting the temperature conditions to 50 ° C. or more and 270 ° C. or less when short-distillation treatment of raw material fats and oils . In the present invention, “saturated hydrocarbon” means a compound not containing a double bond or a triple bond, in particular, having 10 to 56 carbon atoms (preferably 20 to 35 carbon atoms) among the compounds. I mean one.

The temperature conditions of the short stroke distillation process in the present invention correspond to the temperature (evaporator temperature) of the evaporation surface of the short stroke distillation apparatus. In the present invention, “raw material fats and oils are subjected to short-stroke distillation treatment under temperature conditions of 50 ° C. or more and 270 ° C.” means that the raw material fats and oils are brought into contact with the evaporation surface (evaporator) at a temperature of 50 ° C. or more and 270 ° C. or less It means that.

Thermally unstable substances and high-boiling substances contained in the raw material fats and oils when the temperature condition of short stroke distillation treatment is 50 ° C. or higher, preferably 80 ° C. or higher, more preferably 120 ° C. or higher, still more preferably 200 ° C. or higher. The content of saturated hydrocarbon can be efficiently reduced while removing Within the temperature conditions of the present invention, the higher the temperature, the easier it is to reduce the content of saturated hydrocarbon.

When the temperature condition of the short stroke distillation treatment is 270 ° C. or less, preferably 230 ° C. or less, the fraction fraction can be reduced, and the content of saturated hydrocarbon can be reduced while increasing the yield.

More preferable temperature conditions in the short stroke distillation treatment are 80 ° C. to 120 ° C., 80 ° C. to 270 ° C., 80 ° C. to 230 ° C., 120 ° C. to 230 ° C., 160 ° C. to 270 ° C., 160 ° C. The range is 230 ° C. or less, 200 ° C. or more and 270 ° C. or less, and 200 ° C. or more and 230 ° C. or less.

As a result of studies by the present inventor, it was unexpectedly found that the slower the feed rate of the raw material fats and oils to the short stroke distillation apparatus used in the short stroke distillation process, the easier it is to reduce the content of saturated hydrocarbons. Specifically, the feed rate of the raw material fat and oil to the short stroke distillation apparatus is preferably 30.0 kg / h · m ² or less, more preferably 25.0 kg / h, per unit area of the evaporation surface of the short stroke distillation apparatus. If it is m ² or less, the content of saturated hydrocarbon can be more easily reduced. The lower limit of the feed rate of the raw material fats and oils to the short stroke distillation apparatus is not particularly limited, but per unit area of the evaporation surface of the short stroke distillation apparatus, preferably 1.00 kg / h · m ² or more, more preferably 5.00 kg / H · m ² or more.

Preferred feed rate of the raw material oils and fats to a short path distillation apparatus, per unit area of the evaporation surface of the short path distillation apparatus, 1.00kg / h · ^{m 2} or more 30.0kg / h · ^{m 2} or less, 5.00 kg / h · ^{m 2} more than 30.0kg / h · ^{m 2} or less, 1.00kg / h · ^{m 2} more than 25.0kg / h · ^{m 2} or less, 5.00kg / h · ^{m 2} more than 25.0kg / h · m The range of ² or less is mentioned.

In the present invention, the "feed rate of the raw material fats and oils per unit area of the evaporation surface of the short stroke distillation apparatus" is a value obtained by dividing the feed rate of the raw material fats and oils per hour by the area of the evaporation surface.

Moreover, as a result of examination of the present inventor, surprisingly, even if the temperature condition in the short stroke distillation process is low, the raw material fat is slowed down to the evaporation surface of the short stroke distillation apparatus, thereby the raw material It has been found that the content of saturated hydrocarbons in fats and oils can be further reduced. Specifically, the upper limit value of the temperature condition in the short stroke distillation treatment is 200 ° C. or less (preferably 160 ° C. or less), and the feed rate of the raw material fats and oils to the short stroke distillation device is the evaporation surface of the short stroke distillation device The saturated hydrocarbon in the raw material fats and oils is 25.0 kg / h · m ² or less per unit area (preferably 10.0 kg / h · m ² or less, more preferably 8.5 kg / h · m ² or less) It is easier to reduce the content of The lower limit of the temperature condition in the short stroke distillation treatment is not particularly limited, but may be 50 ° C. or more. Although the lower limit of the said supply speed of the raw material fats and oils to a short stroke distillation apparatus is not specifically limited, You may be 1.0 kg / h * m < ² > or more per unit area of the evaporation surface of a short stroke distillation apparatus.

When the temperature condition in the short stroke distillation process is a low temperature of 50 ° C. or more and 200 ° C. or less, supply of the raw material fat and oil to the short stroke distillation device from the viewpoint of easier reduction of the content of saturated hydrocarbon in the raw material fat and oil The upper limit of the velocity is 30.0 kg / h · m ² or less (preferably 5.0 kg / h · m ² or more and 25.0 kg / h · m ² or less) per unit area of the evaporation surface of the short stroke distillation apparatus. May be

The pressure condition (evaporator vacuum degree) in the short stroke distillation treatment is preferably close to 0 (zero) Pa from the viewpoint of easy removal of saturated hydrocarbons, thermally unstable substances, high-boiling substances and the like. Specifically, the short stroke distillation treatment in the present invention is preferably performed at a vacuum of 0.1000 Pa or less, more preferably 0.0800 Pa or less, still more preferably 0.0200 Pa or less, and most preferably 0.0100 Pa or less May be The lower limit of the pressure condition in the short stroke distillation treatment is preferably a degree of vacuum of 0.0001 Pa or more.

Preferred pressure conditions in the short stroke distillation treatment are, for example, in the range of 0.0001 Pa to 0.1000 Pa, 0.0001 Pa to 0.0800 Pa, 0.0001 Pa to 0.0200 Pa, or 0.0001 to 0.0100 Pa. It can be mentioned.

The "degree of vacuum" in the present invention is expressed on an absolute pressure basis. This value indicates how close to the ideal vacuum state (absolute vacuum), with the absolute vacuum being zero.

As a result of the present inventors' investigation, it is surprising that, even if the temperature condition in the short stroke distillation process is low, the content of saturated hydrocarbon in the raw material fat and oil is further reduced by lowering the pressure in the short stroke distillation process. It has been found that it can be reduced. Specifically, the upper limit of the temperature condition in the short stroke distillation treatment is 200 ° C. or less (preferably 180 ° C. or less), and the pressure condition is a vacuum degree of 0.0001 Pa or more and 0.0200 Pa or less. It is easier to reduce the content of saturated hydrocarbons in it. In the above case, the lower limit of the temperature condition in the short stroke distillation treatment is not particularly limited, but may be 80 ° C. or more.

The treatment time of the short stroke distillation treatment refers to the time during which fats and oils are present on the evaporation surface of the short stroke distillation apparatus, and is not particularly limited, but from the viewpoint of performing sufficient distillation, preferably 0.5 seconds or more, more preferably It may be 1 second or more, more preferably 3 seconds or more, and even more preferably 5 seconds or more. Further, from the viewpoint of suppressing the thermal effect on the raw material fats and oils, the treatment time of the short stroke distillation treatment is preferably 5 minutes or less, more preferably 3 minutes or less, still more preferably 1 minute or less, most preferably 30 seconds or less It may be

The short stroke distillation apparatus used in the short stroke distillation process is not particularly limited, but a falling film type, centrifugal type, rising liquid film type, wiped film type evaporator or the like can be used. A wiped film type evaporator is preferable from the viewpoint that the residence time of the raw material fat and oil in the short stroke distillation apparatus is short and the heat influence on the raw material fat and oil can be reduced. The material of the evaporation surface of the short stroke distillation apparatus is not particularly limited, and glass or stainless steel can be used.

The reduction method of the present invention can be carried out at any timing in the purification process of the raw material fat and oil. For example, the reduction method of the present invention may be carried out before the separation step, before the deodorization step or after the deodorization step. The conditions of each purification step (degumming step, deacidifying step, water washing step, decoloring step, deodorizing step, fractionation step etc.) carried out before and after the reduction method of the present invention are not particularly limited, and are usually employed in oil and fat purification Conditions can be applied.

After carrying out the reduction method of the present invention, the obtained fat and oil may be passed as it is as a refined fat and oil, or may be subjected to a further purification step. For example, when the raw material fat and oil is fat and oil obtained through a decoloring step and the like, the deodorizing step and the like may be performed after the reduction method of the present invention is performed on the fat and oil. When the raw material fats and oils are fats and oils obtained through a deodorizing process etc., after implementing the reduction method of this invention with respect to this fats and oils, you may implement a isolation | separation process etc. When the raw material fat is an unrefined fat, after the reduction method of the present invention is carried out, the obtained fat may be passed as it is as a refined fat, or may be subjected to a further purification step.

It is preferable that the raw material fat and oil does not pass heating at 200 ° C. or higher (preferably 180 ° C. or higher) because the content of diglycerides in the fat and oil can also be reduced by implementing the reduction method of the present invention. Diglycerides are the causative agents of 3-chloropropane-1,2-diol (3-MCPD) and glycidol which can be generated by heating fats and oils. Therefore, if the raw material fat to be subjected to the reduction method of the present invention is a fat not subjected to heating at 200 ° C. or higher (preferably 180 ° C. or higher), the generation of 3-MCPD and glycidol is suppressed in the obtained refined fat. It can be done. As a process of heating 200 degreeC or more (preferably 180 degreeC or more) with respect to fats and oils, a deodorizing process etc. are mentioned normally. Therefore, fats and oils not subjected to the deodorizing step may be mentioned as fats and oils which have not been heated at 200 ° C. or more (preferably 180 ° C. or more). In other words, the reduction method of the present invention is preferably performed before the deodorizing step.

In the reduction method of the present invention, the effect of reducing the content of saturated hydrocarbon can be obtained by performing it once on the raw material fat and oil, but the effect of reducing the content can be more effectively obtained by repeating it twice or more. . For example, the reduction method of the present invention may be preferably repeated two or more times, more preferably three or more times. The upper limit of the number of times of implementation of the reduction method of the present invention is not particularly limited, but may be 5 or less. When the reduction method of the present invention is carried out a plurality of times, it may be carried out continuously, but another step (for example, a separation step) may be carried out between each reduction method.

[Raw material fat and oil]
It does not specifically limit as raw material fats and oils used for the reduction method of this invention, Arbitrary fats and oils can be used. For example, it may be a refined oil processed by a degumming process, a deacidification process, a water washing process, etc., or it may be an unrefined oil. The main component in the raw material fat and oil is glyceride, but as the other components, for example, plant sterols, lecithin, antioxidant components (tocopherol and the like), pigment components and the like may be contained.

When the raw material fat and oil is a refined oil, the method for refining the fat and oil is not particularly limited, but any of chemical refining (chemical refining) and physical refining (physical refining) may be used. The former chemical purification is a purification method in which crude oil obtained by squeezing / extracting a plant serving as a raw material is subjected to an alkali deacidification treatment. For example, crude oil is refined through degumming treatment, alkali deacidification treatment, decolorization treatment, dewaxing treatment, deodorization treatment, and this is a purification method in which this is used as a refined oil. The latter physical refining is a refining method in which the crude oil is not subjected to an alkaline deacidification treatment. For example, the crude oil is refined by degassing, deacidification without using an alkali by distillation, etc., decolorization, deodorization, and this is a refining method to make it a refined oil.

It is preferable that the raw material fats and oils have some impurities removed, and for example, fats and oils subjected to a deodorizing process, RBD (Refined Bleached Deodorised) oil and the like subjected to a deacidifying process, a decoloring process and a deodorizing process can be preferably used.

The type of raw material fat is not particularly limited, and rapeseed oil, soybean oil, rice oil, safflower oil, grape seed oil, sunflower oil, wheat germ oil, corn oil, cotton seed oil, cotton oil, sesame oil, peanut oil, flax oil, sesame seeds Vegetable oils such as olive oil, palm oil and coconut oil, mixed vegetable oils obtained by mixing two or more of them, or edible oleic oils such as palm olein, palm stearin, palm super olein and palm mid fraction obtained by fractionating these In addition to hydrogenated oils, transesterified oils, etc., edible oils produced by direct esterification reaction such as medium-chain fatty acid triglyceride can be used.

From the viewpoint that the effect of the present invention is easily obtained, it is preferable that the raw material fat and oil is a palm based fat and oil. As palm fats and oils, fats and oils derived from palm are mentioned. Specific examples of palm oils and fats include palm oil, palm kernel oil, fractionated oil of palm oil, fractionated oil of palm kernel oil, hydrogenated oil of palm oil, hydrogenated oil of palm kernel oil, fractionated palm oil A hydrogenated oil of oil, a hydrogenated oil of fractionated oil of palm kernel oil, an esterified oil of these, and the like can be mentioned. Examples of fractionated oils of palm oil include superolein, palm olein, palm mid fraction, and palm stearin, and examples of fractionated oils of palm kernel oil include palm kernel olein and palm kernel stearin.

[Identification of the content of saturated hydrocarbons in refined fats and oils]
According to the reduction method of the present invention, it is possible to obtain a refined fat and oil having a reduced content of saturated hydrocarbon. According to the reduction method of the present invention, in particular, it is possible to obtain a refined fat and oil in which the content of saturated hydrocarbon having 20 to 35 carbon atoms is reduced.

For example, when the raw material oil and fat is palm oil and fat, according to the reduction method of the present invention, the content of saturated hydrocarbon having 20 to 35 carbon atoms is preferably 15 mg / kg or less, more preferably 10 mg / kg or less More preferably, it is 5.0 mg / kg or less, Most preferably, the refinement | purification palm fats and oils which are 2.0 mg / kg or less can be obtained. The lower limit of the content of the saturated hydrocarbon having 20 to 35 carbon atoms in the refined palm-based oil or fat subjected to the reduction method of the present invention is preferably 0 mg / kg or less than the detection limit, but 1.5 mg / kg or more It may be

Furthermore, according to the reduction method of the present invention, the acid value and peroxide value of the refined fat and oil can also be reduced.

The content of saturated hydrocarbons in fats and oils, the acid number and the peroxide number are specified by the methods described in the examples.

EXAMPLES Hereinafter, the present invention will be specifically described by showing examples, but the present invention is not limited to these examples.

<Test 1: Examination of various conditions in short stroke distillation process>
Raw material palm-based fats and oils (RBD palm oil, corresponding to raw material fats and oils), short stroke distillation apparatus KDL6 type (manufactured by UIC GmbH, stainless steel evaporation surface 600 cm ² , condensation surface 600 cm ² , maximum flow 3 to 10 L / Hr) was applied to the evaporation surface and subjected to short-stroke distillation under the conditions shown in Table 1. In addition, the residence time of the raw material palm-based oil and fat on the evaporation surface of the short stroke distillation apparatus (that is, the processing time of the short stroke distillation treatment) was set in the range of 1 second to 30 seconds.

The residue and distillate after short-stroke distillation under the above conditions were collected. In addition, in Table 1, a "fraction rate" shows the ratio of a distillate among the totals of the extract | collected residue and distillate. The lower the fraction, the higher the yield.

The physical properties and the composition of the raw material palm-based fat and oil before the short stroke distillation treatment and the residual content (corresponding to the refined fat and oil) after the short stroke distillation treatment were examined as follows. The results are shown in Table 1.

[Chromaticity]
The chromaticity (Y value, R value) was measured based on "Standard oil and fat analysis test method 2.2.1-1996 Lovibond method" edited by the Japan Oil Chemistry Association. For measurement, a Lobibond colorimeter (cell length: 133.4 mm) was used.

[Acid number]
It measured based on "Japan Oil Chemical Society" edited by "standard fats-and-oils analysis test method 2.3.1-1996 acid value".

[Peroxide value]
It was measured based on "Standard oil and fat analysis test method 2.5.2.1-2013 Peroxide value" edited by the Japan Oil Chemistry Association.

[Auto-oxidative stability of fats and oils (CDM)]
The auto-oxidative stability (CDM) of fats and oils was measured based on "Standard Fat and Oil Analysis Test Method 2.5.1.2-1996" edited by the Japan Oil Chemistry Association. The higher the CDM reading, the more the oil is auto-oxidized.

[Raising melting point]
The melting point (Slipping Point) was measured based on "Standard Oil and Fat Analysis Test Method 2.2.4.2-1996" edited by the Japan Oil Chemistry Association.

[Determination of saturated hydrocarbon content]
The saturated hydrocarbon content was measured according to the following method.
(1) 3 ppm of internal standard substance (bicyclohexyl) was added to 200 mg of each oil and fat sample, and dissolved in 1 mL of hexane.
(2) The sample of the above (1) was placed on a 2 g silica solid phase extraction column conditioned with hexane and adsorbed.
(3) The saturated hydrocarbon was eluted with hexane from the column of (2) above. The first 1 mL was discarded, followed by 3 mL, which was taken as the saturated hydrocarbon fraction.
(4) The saturated hydrocarbon fraction was concentrated to about 300 μL and measured by gas chromatography (on-column injection) under the following conditions.
(4-1) Column Pre-column: Inactivated fused silica column, length 10 m, internal diameter 0.53 mm
Analysis column: 100% dimethylpolysiloxane, length 15 m, inner diameter 0.32 mm, film thickness 0.1 μm
(4-2) Injection Carrier gas: Helium injection amount: 40 μL
Inlet temperature conditions: 60 ° C (hold for 4 minutes) → 20 ° C / minute temperature rise → 380 ° C (hold for 15.5 minutes)
Pressure condition: 60kPa (hold for 4 minutes) → 70kPa / minute pressure increase → 130kPa (hold for 30.5 minutes)
Column flow rate: 3.55 mL / min (4-3) Oven Temperature: 50 ° C (hold for 4 minutes) → 20 ° C / min Temperature rise → 380 ° C (hold for 15 minutes)
(4-4) FID detector temperature: 380 ° C
(5) Using the chromatogram obtained by the gas chromatography measurement of (4) above, comparing the area of the internal standard substance with the area of the saturated hydrocarbon (the area of the hump raised from the baseline) And the content of saturated hydrocarbons were identified.

In the following table, "C20-35" means the amount of saturated hydrocarbon having 20 to 35 carbon atoms. “C10-56” means the amount of saturated hydrocarbons having 10 to 56 carbon atoms.

As shown in Table 1, according to the reduction method of the present invention, it was found that a refined oil and fat having a low content of saturated hydrocarbon (refined palm oil) was obtained. Further, according to the reduction method of the present invention, the increase of the acid value and the peroxide value and the auto-oxidation were suppressed.

Also, as shown in Examples 2 to 5, it was found that the higher the temperature of the short stroke distillation process (evaporator temperature), the more the content of saturated hydrocarbon can be reduced. However, from the viewpoint of reducing the fraction fraction and increasing the yield and reducing the content of saturated hydrocarbons, the temperature of the short stroke distillation treatment is preferably 230 ° C. or less.

As shown by the comparison between Example 1 and Example 5, even when the temperature of the short stroke distillation process is low, the short feeding speed of the raw material fats and oils to the evaporation surface of the short stroke distillation apparatus enables the short It was found that a refined oil having a low content of saturated hydrocarbons was obtained as well as when the temperature of the stroke distillation process was high.

<Test 2: Examination of temperature conditions in short stroke distillation process>
In the same manner as in Test 1, short-path distillation was performed on the raw material palm-based fats and oils (RBD palm oil, which corresponds to the raw-material fats and oils) under the conditions shown in Table 2. The content of saturated hydrocarbons was measured in the same manner as in Test 1 with respect to the raw material palm-based fat and oil before the short stroke distillation treatment and the residual content after the short stroke distillation treatment (corresponding to the refined fat and oil). The results are shown in Table 2.

As shown in Table 2, it was found that the higher the short stroke distillation temperature (evaporator temperature), the more the content of saturated hydrocarbon can be reduced.

In addition, even when the temperature of the short stroke distillation process is low, by reducing the pressure (evaporator vacuum degree) of the short stroke distillation process, it is possible to use saturated hydrocarbons as well as the case where the temperature of the short stroke distillation process is high. There was a tendency to obtain refined fats and oils with a low content.

<Test 3: Examination of the number of short stroke distillation processes>
The raw material palm-based oil / fat (RBD palm oil, which corresponds to the raw material oil-and-fat) was subjected to short-stroke distillation under the conditions shown in Table 3 and residuals were collected in the same manner as in Test 1 Inside "1 Pass"). Subsequently, the same short stroke distillation treatment was again performed on the residue (1 Pass), and the residue was collected ("2 Pass" in Table 3). Subsequently, the same short-stroke distillation treatment was again performed on the residue (2 Pass), and the residue was collected ("3 Pass" in Table 3). The content of saturated hydrocarbon was measured in the same manner as in Test 1 with respect to 10 g of a raw material palm-based fat and oil before short stroke distillation treatment and 10 g of each residual content after short stroke distillation treatment (corresponding to purified fat and oil). The results are shown in Table 3.

As shown in Table 3, it was found that repeating the short stroke distillation process can further reduce the content of saturated hydrocarbons.

Claims (11)

A method for reducing the content of saturated hydrocarbons in refined fats and oils comprising subjecting the raw fats and oils to short stroke distillation treatment at a temperature condition of 50 ° C. or more and 270 ° C. or less. In the short stroke distillation process, the feed rate of the raw material fat and oil to the short stroke distillation device is 30.0 kg / h · m ² or less per unit area of the evaporation surface of the short stroke distillation device. How to reduce The feed rate, the short path distillation apparatus at the evaporation surface 25.0 kg / h · ^{m 2} per unit area 5.00 kg / h · ^{m 2} or more of the following, reducing method according to claim 2. The reduction method according to any one of claims 1 to 3, wherein the pressure condition in the short stroke distillation treatment is a vacuum degree of 0.1000 Pa or less. The upper limit value of the temperature condition in the short stroke distillation treatment is 200 ° C. or less, and the feed rate of the raw material fats and oils to the short stroke distillation device is 25.0 kg / per unit area of the evaporation surface of the short stroke distillation device. The reduction method according to any one of claims 1 to 4, which is h · m ² or less. The reduction method according to any one of claims 1 to 5, wherein the upper limit value of the temperature condition in the short stroke distillation treatment is 200 ° C or less, and the pressure condition is a vacuum degree of 0.0001 Pa or more and 0.0200 Pa or less. . The reduction method according to any one of claims 1 to 6, wherein the short stroke distillation treatment is performed twice or more. The reduction method according to any one of claims 1 to 7, wherein the raw material fat and oil is a fat and oil which has not been heated at 200 ° C or more. The reduction method according to any one of claims 1 to 8, wherein the raw material fat and oil is palm based fat and oil. The reduction method according to claim 9, wherein a content of saturated hydrocarbon in the palm oil fat after the short stroke distillation treatment is 15 mg / kg or less. The refined palm fats and oils whose content of a C20 or more and 35 or less saturated hydrocarbon is 15 mg / kg or less.